Development of Metal Substrates for Neutron-focusing Supermirrors

In this study, we established a low-cost, high-precision process for fabricating all-metal substrates supermirrors neutron focusing. The key material substrate is amorphous plating, which can be polished to achieve the sub-nm surface roughness required fabricate multilayer supermirrors, and phosphorus-rich electroless Ni-P plating. This fabrication was through multiple prototypes of focusing mirrors SOFIA reflectometer at J-PARC MLF BL16. paper describes technical difficulties overcome in development.